The heart-wrenching news over the weekend came in waves, a tsunami of senseless tragedy and calculated malevolence. Two dead and several others wounded in a mass shooting at Brown University in Rhode Island; two U.S. national guardsmen and an interpreter ambushed and murdered in Syria; 15 dead and 40 wounded after a terror attack in Australia targeting Jews celebrating the start of Hanukkah. Evil reared its ugly head across the globe. The motive behind this country’s most recent mass school shooting remains a mystery as of Wednesday. Authorities had yet to make an arrest. The impetus behind the other two...